<configuration>
    <appSettings>
        <WorkingDirectory>C:Working</WorkingDirectory>
    </appSettings>
    <connectionStrings>
        <add name="ApplicationEntities"
             connectionString="[TestingConnectionString]"
             providerName="System.Data.EntityClient" />
    </connectionStrings>
</configuration>

<configuration>
    <appSettings>
        <WorkingDirectory>\prodserverWorking</WorkingDirectory>
    </appSettings>
    <connectionStrings>
        <add name="ApplicationEntities"
             connectionString="[ProductionConnectionString]"
             providerName="System.Data.EntityClient" />
    </connectionStrings>
</configuration>

<Fragment>
    <ComponentGroup Id="ProductComponents" Directory="INSTALLFOLDER">
        <Component Id="ProductComponent" Guid="{MY-GUID}">
            <File Id="Application.exe"
                  Name="Application.exe"
                  Source="..Application.exe"
                  Vital="yes"
                  KeyPath="yes"
                  DiskId="1" />
            <File Id="Application.exe.config"
                  Name="Application.exe.config"
                  Source="..Application.exe.config"
                  Vital="yes"
                  KeyPath="no"
                  DiskId="1" />
        </Component>
    </ComponentGroup>
</Fragment>

<Component Id="development.app.config" Guid="*">

    <Condition>DEVELOPMENT</Condition>
    <File Name="development.app.config" KeyPath="yes">
        <CopyFile Id="development.app.config" DestinationName="app.config" />
    </File>

    <util:XmlFile
        Id="WorkingDirectory"
        Action="setValue"
        File="app.config"
        ElementPath="/configuration/appSettings"
        Name="WorkingDirectory"
        Value="C:Working"
        Permanent="no" />

</Component>

<Component Id="production.app.config" Guid="*">

    <Condition>PRODUCTION</Condition>
    <File Name="production.app.config" KeyPath="yes">
        <CopyFile Id="production.app.config" DestinationName="app.config" />
    </File>

    <util:XmlFile
        Id="WorkingDirectory"
        Action="setValue"
        File="app.config"
        ElementPath="/configuration/appSettings"
        Name="WorkingDirectory"
        Value="\prodserverWorking"
        Permanent="no" />

</Component>